dt-bindings: mmc: sunxi: add compatible strings for Allwinner A523

The Allwinner A523 uses the same MMC IP as the D1.

Introduce the new specific compatible strings, and use them with
fallbacks to the D1 strings.

Signed-off-by: Andre Przywara <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Andre-ARM

Documentation/devicetree/bindings/mmc/allwinner,sun4i-a10-mmc.yaml

@@ -50,10 +50,14 @@ properties:
           - enum:
               - allwinner,sun20i-d1-emmc
               - allwinner,sun50i-h616-emmc
+              - allwinner,sun55i-a523-emmc
           - const: allwinner,sun50i-a100-emmc
       - items:
           - const: allwinner,sun50i-h616-mmc
           - const: allwinner,sun50i-a100-mmc
+      - items:
+          - const: allwinner,sun55i-a523-mmc
+          - const: allwinner,sun20i-d1-mmc
 
   reg:
     maxItems: 1